. >>> one week ago tonight the nation was shocked by what happened in newtown, connecticut. tonight and today they paused to remember it. bells rang 26 times, one for each of the children and adults killed by adam lanza. and we are learning more about the killer. a classmate says lanza could take apart and reassemble a computer in a matter of minutes, but rarely spoke to anyone. >>> we heard today from the national rifle association for the first time since the masacre. officials from the nation's most influential gun lobby group called for armed guards to protect schools. the nra blamed video games for violence against children. hear from the nra and those who lost loved ones in mass shootings. >>> an east bay high school football star shot and killed in san francisco was honored tonight. sergio quintana was in the high school. >> his closest friends pay tribute through funny stories. >> my mom would always make hill food. he would love garbonzo beans. i don't know why, but he just did. >> members of the football team honored their fellow football player with a video after